Abstract: By combining a white balance shift in your camera with a complementary gelling of your flash, you can easily and efficiently alter the ambient color temperature of an entire environment.
In addition to controlling the color of light from your flash, gels can also allow you to alter the color of the ambient areas of your frame. The portrait above, done for the Baltimore Sun, is a good example. I made it as a storm approached, and the light was gray and pretty neutral.
The light was okay, but not great. I really wanted was a stronger color environment for the photo. And I also wanted the subject to pop more. So instead of daylight white balance, I shot it on incandescent (tungsten) white balance. This shifted the expected light source from 5600k to 3200k. In essence, the camera was expecting to shoot under tungsten lights. Read more »